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Methods Of Providing Antioxidants To Implantable Medical Devices

a technology of medical devices and antioxidants, applied in the field of chemical engineering and medical devices, can solve the problems of affecting the quality of life of patients, and prolonging the recovery period, so as to achieve the effect of reducing the risk of complications, avoiding surgery, and reducing the effect of surgery

Inactive Publication Date: 2009-10-01
ABBOTT CARDIOVASCULAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While effective and having evolved to a relatively high degree of safety for such an invasive procedure, by-pass surgery still involves serious potential complications and in the best of cases, an extended recovery period.
However, PTCA brought with it another problem, elastic recoil of the stretched arterial wall which could undo much of what was accomplished and, in addition, failed to satisfactorily ameliorate another problem, restenosis, the re-clogging of the treated artery.
This for all intents and purposes put an end to recoil but did not entirely resolve the issue of restenosis.
Polymers that biodegrade in the body may also degrade during the process of manufacturing, or during storage.

Method used

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  • Methods Of Providing Antioxidants To Implantable Medical Devices
  • Methods Of Providing Antioxidants To Implantable Medical Devices
  • Methods Of Providing Antioxidants To Implantable Medical Devices

Examples

Experimental program
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Effect test

example 1

Sublimation of BHT

[0110]A study was performed that demonstrated the sublimation of BHT. In the first experiment, 100 mg of BHT was weighed in an aluminum pan and heated in a convection oven at 55° C. At 1 hour and 16 hours after placement in the oven, the pan was removed and weighed. At the next time point, after leaving the pan in the oven overnight, no solids were present. A subsequent experiment was carried out utilizing a temperature of 70° C., and weighted at time-points of 30 minutes and 1 hr. The melting point of BHT is 70° C. so this temperature was the highest temperature in the experiments. Additional data was obtained from measurements at 40° C. and 50° C. with weight measurements at time-points of 1, 4, 7 and 24 hours. The results are illustrated in FIG. 2 which shows a plot of BHT weight loss vs. time for the different temperatures. As shown in FIG. 2, it is clear that BHT sublimation occurred at temperatures under 70° C.

[0111]FIG. 3 is a plot of Ln (BHT / BHT0) vs. time....

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Abstract

Methods of incorporating an antioxidant into a medical device including a polymer are described, and methods of packaging medical devices.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is a continuation-in-part of U.S. application Ser. No. 11 / 189,216, filed Jul. 25, 2005, and published on Jan. 25, 2007 as U.S. Patent Application Publication No. 2007 / 0020380 A1, which is hereby incorporated by reference as if fully set forth, including any figures, herein.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]This invention relates to the fields of chemistry, chemical engineering, and medical devices.[0004]2. Description of the State of the Art[0005]The discussion that follows is intended solely as background information to assist in the understanding of the invention herein; nothing in this section is intended to be, nor is it to be construed as, prior art to this invention.[0006]Until the mid-1980s, the accepted treatment for atherosclerosis, i.e., narrowing of the coronary artery(ies) was coronary by-pass surgery. While effective and having evolved to a relatively high degree of safety for suc...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K9/00B05D3/00
CPCA61L31/10A61L31/143B65D1/00C08K5/13A61F2/82B65B55/00B65D3/00B65D77/04
Inventor DING, NI
Owner ABBOTT CARDIOVASCULAR
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